CVE-2026-33179Disclosure(libfuse_project / libfuse)

LOWCVSS 5.5 · MEDIUM

Exploit discussion active in current signal (1 latest mentions)

Immediate actions

Patch libfuse_project libfuse systems immediately
Hunt for exploitation attempts and persistence artifacts
Increase monitoring for publicly documented tradecraft

Recommended action window: High priority (within 72h)

NVD description

libfuse is the reference implementation of the Linux FUSE. From version 3.18.0 to before version 3.18.2, a NULL pointer dereference and memory leak in fuse_uring_init_queue allows a local user to crash the FUSE daemon or cause resource exhaustion. When numa_alloc_local fails during io_uring queue entry setup, the code proceeds with NULL pointers. When fuse_uring_register_queue fails, NUMA allocations are leaked and the function incorrectly returns success. Only the io_uring transport is affected; the traditional /dev/fuse path is not affected. PoC confirmed with AddressSanitizer/LeakSanitizer. This issue has been patched in version 3.18.2.

libfuse_project CVEs Back to dashboard

2.0/ 10 priority

Sources & remediation

Patch / fix

https://github.com/libfuse/libfuse/commit/7beb86c09b6ec5aab14dc25256ed8a5ad18554d7

Vendor / third-party advisories

https://github.com/libfuse/libfuse/security/advisories/GHSA-x669-v3mq-r358

Other references

https://github.com/libfuse/libfuse/releases/tag/fuse-3.18.2

Weakness type (CWE)

CWE-476

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

libfuse

Threat summary

Public PoC is present in monitored signal
Patch or workaround signal is available
6 mentions across 4 observed days
Momentum state: stable

What's happening

PoC mentioned or linked in 2 signals
Patch or workaround mentioned in 2 signals
Technical details provided in 5 signals
Disclosure: 3 classified signals
Peaked 3d ago at 2 mentions (2026-03-21); latest day: 1
6 total mentions across 4 days

Affected systems

Vendors

libfuse_project

Products

libfuse

Deep dive

Activity timeline6 mentions / 4d

Signal classification3 categories

Disclosure

350.0%

PoC

233.3%

Patch

116.7%

Referenced assets4 URLs

By indicator

Classification over time

Date	Total	Labels

2026-03-21	2	Disclosure2
2026-03-24	2	PoC2
2026-03-30	1	Patch1
2026-03-31	1	Disclosure1

Full discourse6 posts

Open Source Security mailing list@oss_security202d
Disclosure
libfuse: io_uring memory safety vulnerabilities https://www.openwall.com/lists/oss-security/2026/03/21/2 Affected versions: libfuse >= 3.18.0, < 3.18.2 Fixed in: libfuse 3.18.2 CVE-2026-33150: Use-After-Free CVE-2026-33179: NULL Pointer Dereference + Memory Leak
Post summary
An advisory discloses use‑after‑free and null‑pointer dereference/memory leak bugs in libfuse 3.18.0–3.18.2, specifies a patch in 3.18.2, and provides no evidence of active exploitation.
0501171.8K
4.4K followersView on X
Gray Hats@the_yellow_fall193d
Patch
Researchers uncover two flaws in libfuse's io_uring transport (CVE-2026-33150 & 33179). Impacting Kubernetes CSI drivers, these bugs allow RCE and DoS. Patch now! #libfuse #LinuxSecurity #CyberSecurity #Kubernetes #io_uring #CVE #InfoSec #CloudSecurity https://securityonline.info/libfuse-io-uring-vulnerabilities-cve-2026-33150-cve-2026-33179/ https://t.co/meyHCKpXto
Post summary
Researchers identified two RCE/DoS bugs in libfuse’s io_uring transport that impact Kubernetes CSI drivers, and a patch has already been released.
031111562
12.3K followersView on X
CSIRT Italia@csirt_it198d
PoC
‼️ #Libfuse: disponibile #PoC per lo sfruttamento delle CVE-2026-33150 e CVE-2026-33179 Rischio: 🔴 Tipologia: 🔸 Arbitrary Code Execution 🔸 Privilege Escalation 🔸 Denial of Service 🔗 https://www.acn.gov.it/portale/w/libfuse-disponibile-poc-per-lo-sfruttamento-delle-cve-2026-33150-e-cve-2026-33179 🔄 Aggiornamenti disponibili 🔄 https://t.co/LmbQh1oLhD
Post summary
The tweet announces the availability of a proof‑of‑concept for the Libfuse CVE‑2026‑33150 and CVE‑2026‑33179, highlighting severe impact types but providing no evidence of active exploitation, patches, or false positives.
01050192
8.8K followersView on X
kinneko@kinneko192d
Disclosure
Critical libfuse io_uring Vulnerabilities Threaten Linux and Kubernetes Infrastructure https://securityonline.info/libfuse-io-uring-vulnerabilities-cve-2026-33150-cve-2026-33179/
Post summary
The text announces the discovery of two critical libfuse io_uring CVEs affecting Linux and Kubernetes infrastructure, but provides no additional technical or exploit details.
00002119
2.8K followersView on X
CVE@CVEnew202d
Disclosure
CVE-2026-33179 libfuse is the reference implementation of the Linux FUSE. From version 3.18.0 to before version 3.18.2, a NULL pointer dereference and memory leak in fuse_uring_init… https://www.cve.org/CVERecord?id=CVE-2026-33179
Post summary
CVE‑2026‑33179 is a null pointer dereference and memory leak in libfuse versions 3.18.0 to 3.18.1.
01010176
56.8K followersView on X
Hephaestvs@Vulcanux_198d
PoC
csirt_it: ‼️ #Libfuse: disponibile #PoC per lo sfruttamento delle CVE-2026-33150 e CVE-2026-33179 Rischio: 🔴 Tipologia: 🔸 Arbitrary Code Execution 🔸 Privilege Escalation 🔸 Denial of Service 🔗 https://www.acn.gov.it/portale/w/libfuse-disponibile-poc-per-lo-sfruttamento-delle-cve-2026-33150-e-cve-2026-33179 🔄 Aggiornamenti disponibi… https://t.co/STp5RX5LUP
Post summary
The tweet announces a publicly available proof‑of‑concept for CVE‑2026‑33150 and CVE‑2026‑33179 in Libfuse, detailing the associated risk types and linking to the PoC.
0000056
607 followersView on X

CPE platform detail1 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

1 of 1 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	libfuse_project	libfuse	-	-	-

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What researchers are saying

CVE-2026-33179

Open Source Security mailing list@oss_securityDisclosure

An advisory discloses use‑after‑free and null‑pointer dereference/memory leak bugs in libfuse 3.18.0–3.18.2, specifies a patch in 3.18.2, and provides no evidence of active exploitation.

Gray Hats@the_yellow_fallPatch

Researchers identified two RCE/DoS bugs in libfuse’s io_uring transport that impact Kubernetes CSI drivers, and a patch has already been released.

CSIRT Italia@csirt_itPoC

The tweet announces the availability of a proof‑of‑concept for the Libfuse CVE‑2026‑33150 and CVE‑2026‑33179, highlighting severe impact types but providing no evidence of active exploitation, patches, or false positives.

kinneko@kinnekoDisclosure

The text announces the discovery of two critical libfuse io_uring CVEs affecting Linux and Kubernetes infrastructure, but provides no additional technical or exploit details.

CVE@CVEnewDisclosure

CVE‑2026‑33179 is a null pointer dereference and memory leak in libfuse versions 3.18.0 to 3.18.1.

Hephaestvs@Vulcanux_PoC

The tweet announces a publicly available proof‑of‑concept for CVE‑2026‑33150 and CVE‑2026‑33179 in Libfuse, detailing the associated risk types and linking to the PoC.